Power pole isolated heat pipe inverter assembly

ABSTRACT

A power pole inverter is provided. The power pole inverter includes a housing assembly, a capacitor assembly, a number of arm assemblies, a number of heat sinks, and a support assembly. The housing assembly includes a number of sidewalk. The housing assembly sidewalls defining an enclosed space. The capacitor assembly is coupled to the housing assembly. Each arm assembly includes a plurality of electrical components and a number of electrical buses. Each the electrical bus includes a body with terminals, each the terminal structured to be coupled to, and in electrical communication with, the capacitor assembly, each arm assembly including a neutral terminal. Each arm assembly is coupled to, and in electrical communication with, the capacitor assembly. The support assembly includes a non-conductive frame assembly. The support assembly is structured to support each the heat sink in isolation.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation-in-part application of and claimspriority to U.S. patent application Ser. No. 13/834,332, filed Mar. 15,2013, entitled POWER POLE INVERTER.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The disclosed and claimed concept relates to power pole inverters and,more specifically, to a power pole inverter including a number of armassemblies, each including a neutral terminal, wherein each neutralterminal is electrically isolated from the ground and a housingassembly.

2. Background Information

Adjustable Speed or Variable Frequency Drives (ASDs or VFDs) arecommonly used to operate polyphase AC induction motors at any speeddesired by the end user. The advantage of using VFDs include lowstarting currents, low torque shock on equipment coupled to the drivenmotor. They also allow sophisticated control of speed and torqueprofiles as required by end users. VFDs operate by taking eitherincoming AC or DC power, having a fixed frequency and voltage, andconverting it to AC power having a voltage or current with variableamplitude and frequency.

A VFD drive includes a plurality of inverters and a converter which areelectrically coupled through electrical buses and physically coupledthrough their respective modular bases. The inverters may share a commoncooling system connected to the respective heat sinks of each component.That is, a VFD is made up of a plurality of inverter modules, which areconnected to a converter module to create the VFD, wherein each of theabove components is packaged in a relatively small unit having a coolingapparatus. Each of the inverters is made of a modular base, a heat sinkor exchanger connected to the base having a plurality of powersemiconductor switches, a power supply and a gate driver, thermallycoupled thereto, a plurality of capacitors, a plurality of electricalbuses connecting the power semiconductor switches to the capacitors, andan insulative medium which encases or covers some or all of theelectrically live components, such as the electrical buses. It isfurther noted that the conductors wrapped around the heat sink, i.e. theconductors were U-shaped.

The inverters are, generally, assembled as follows. The semiconductorswitches, power supply, gate driver, and other electrical devices,hereinafter “electrical components,” are coupled to the heat sink orbase element. The electrical components are coupled to a bus, or anumber of electrical buses. The heat sink, number of electrical buses,and electrical components are then arranged in an open ended housingassembly. The housing assembly may abut the heat exchange assembly.Thus, the housing assembly is open on one end and otherwise encloses theheat sink and electrical components. The electrical devices associatedwith the Power Pole arm are encapsulated with an insulating pottingcompound such as, but not limited to, silicone based compound, and thepotting compound is cured and forms part of the physical protection.Thus, the number of electrical buses, and electrical components areencased in the potting compound. Alternatively, a minor portion of acomponent could be exposed. Thus, all, or substantially all, of thecomponents were enclosed.

SUMMARY OF THE INVENTION

The disclosed and claimed concept provides an arm assembly wherein theinsulating material, hereinafter a “sealing compound,” is applied to theelectrical bus and to a limited number of electrical components. Thatis, the arm assembly includes a heat exchanger assembly, a plurality ofelectrical components thermally coupled to the heat exchanger assembly,and a number of electrical buses. A sealing compound is then applied toeach electrical bus and to a limited number of the electricalcomponents. Thus, a limited number of electrical components aresubstantially sealed from an atmosphere. The components that are notencased in the sealing compound may be repaired or replaced on site.

The arm assembly may be one of a number of arm assemblies that are partof a power pole inverter. The power pole inverter includes a supportassembly, a number of capacitor sets, each capacitor set coupled to thesupport assembly, and a number of inverter assemblies. Each arm assemblyis coupled to, and in electrical communication with, one capacitor set.As before, each arm assembly includes a heat exchanger assembly, aplurality of electrical components thermally coupled to the heatexchanger assembly, and a number of electrical buses. Each electricalcomponent is coupled to, and in electrical communication with, a numberof electrical buses. A encapsulating compound is then applied to eachelectrical bus and to a limited number of the electrical components.Thus, a limited number of electrical components are substantially sealedfrom an atmosphere. The components that are not encased in the sealingcompound may be repaired or replaced on site.

The disclosed and claimed concept further provides for a power poleinverter including a housing assembly, a capacitor assembly, a number ofarm assemblies, a number of heat sinks, and a support assembly. Thehousing assembly includes a number of sidewalls. The housing assemblysidewalls define an enclosed space. The capacitor assembly is coupled tothe housing assembly. Each arm assembly includes a plurality ofelectrical components and a number of electrical buses. Each electricalbus includes a body with terminals wherein each terminal structured tobe coupled to, and in electrical communication with, the capacitorassembly, and each arm assembly including a neutral terminal. Each armassembly is coupled to, and in electrical communication with, thecapacitor assembly. The support assembly includes a non-conductive frameassembly. The support assembly is structured to support each heat sinkin isolation. Each heat sink is coupled to the frame assembly. Each armassembly neutral terminal is coupled to, and in electrical communicationwith, an associated heat sink. In this configuration, each neutralterminal is electrically isolated from the housing assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

A full understanding of the invention can be gained from the followingdescription of the preferred embodiments when read in conjunction withthe accompanying drawings in which:

FIG. 1 is an isometric exploded view of a power pole inverter.

FIG. 2 is an isometric exploded view of an arm assembly.

FIG. 3 is an isometric view of a frame assembly.

FIG. 4 is an isometric view of a frame assembly and support chassis.

FIG. 5 is an isometric view of a heat exchanger isolation assembly.

FIG. 6 is a side view of a heat exchanger isolation assembly.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

As used herein, the singular form of “a,” “an,” and “the” include pluralreferences unless the context clearly dictates otherwise.

As used herein, the term “number” shall mean one or an integer greaterthan one (i.e., a plurality).

As used herein, the statement that two or more parts or components are“coupled” shall mean that the parts are joined or operate togethereither directly or indirectly, i.e., through one or more intermediateparts or components, so long as a link occurs. As used herein, “directlycoupled” means that two elements are directly in contact with eachother. As used herein, “fixedly coupled” or “fixed” means that twocomponents are coupled so as to move as one while maintaining a constantorientation relative to each other.

As used herein, a “coupling assembly” includes two or more couplings orcoupling components. The components of a coupling or coupling assemblyare generally not part of the same element or other component. As such,the components of a “coupling assembly” may not be described at the sametime in the following description. Further, a “removable couplingassembly” is a coupling assembly wherein the components are easilyseparated, such as, but not limited to a nut and bolt.

As used herein, a “coupling” is one element of a coupling assembly. Thatis, a coupling assembly includes at least two components, or couplingcomponents, that are structured to be coupled together. It is understoodthat the elements of a coupling assembly are compatible with each other.For example, in a coupling assembly, if one coupling element is a snapsocket, the other coupling element is a snap plug.

As used herein, the statement that two or more parts or components“engage” one another shall mean that the parts exert a force against oneanother either directly or through one or more intermediate parts orcomponents.

As used herein, the word “unitary” means a component is created as asingle piece or unit. That is, a component that includes pieces that arecreated separately and then coupled together as a unit is not a“unitary” component or body.

As used herein, “correspond” indicates that two structural componentsare sized and shaped to be similar to each other and may be coupled witha minimum amount of friction. Thus, an opening which “corresponds” to amember is sized slightly larger than the member so that the member maypass through the opening with a minimum amount of friction. Thisdefinition is modified if the two components are said to fit “snugly”together or “snuggly correspond.” In that situation, the differencebetween the size of the components is even smaller whereby the amount offriction increases. If the element defining the opening and/or thecomponent inserted into the opening are made from a deformable orcompressible material, the opening may even be slightly smaller than thecomponent being inserted into the opening. This definition is furthermodified if the two components are said to “substantially correspond.”“Substantially correspond” means that the size of the opening is veryclose to the size of the element inserted therein. That is, not so closeas to cause substantial friction, as with a snug fit, but with morecontact and friction than a “corresponding fit,” i.e. a “slightlylarger” fit.

Directional phrases used herein, such as, for example and withoutlimitation, top, bottom, left, right, upper, lower, front, back andderivatives thereof, relate to the orientation of the elements shown inthe drawings and are not limiting upon the claims unless expresslyrecited therein.

As shown in FIG. 1, a power pole inverter 10 includes a housing assembly12, a capacitor assembly 14, a number of arm assemblies 16 and aconductive output bus assembly 19. As shown, in an exemplary embodimentthe housing assembly 12 includes a number of generally planar sidewalls17, a fan assembly 18, a movable trolley 24, and an electricallyisolating support assembly 20, as discussed in detail below. The housingassembly sidewalls 17 define an enclosed space 21. In an exemplaryembodiment, the housing assembly sidewalls 17 define a parallelepiped. Anumber of housing assembly sidewalls 17 include vents (not shown) thatallow air to pass into, and out of, the enclosed space 21. In anexemplary embodiment, the fan assembly 18 is disposed adjacent thevents. The fan assembly 18 includes a number of fan units 23. Each fanunit 23 is structured to move a fluid and, in an exemplary embodiment,air. The capacitor assembly 14 includes a number of capacitors (notshown) disposed within a housing 15. The capacitor assembly 14 includesa number of terminals 13 and, in an exemplary embodiment, a number ofpositive terminals 13′, negative terminals 13′″, and neutral terminals13′41 The capacitor assembly 14 is coupled to the housing assembly 12and, in an exemplary embodiment, the bottom sidewall of the capacitorassembly housing 15 is the bottom wall of the housing assembly 12.

Each arm assembly 16 is coupled to, and in electrical communicationwith, the capacitor assembly 14, as discussed below. As discussed below,an “arm assembly 16” may be a half-phase arm assembly or a full-phasearm assembly; the term “arm assembly” refers to either. Each armassembly 16 includes a heat exchanger assembly 30, a plurality ofelectrical components 50, a number of electrical buses 70, and a sealingcompound 100. The arm assemblies 16 are substantially similar and onlyone will be described. As shown in FIG. 2, heat exchanger assembly 30includes a heat sink 32, a heat exchanger 34 and a number of fluidconduits 36. Heat sink 32 is, in an exemplary embodiment, a rectangularplanar member 38 having a height, a width and a thickness. Heat sinkplanar member 38 includes a number of fluid passages 40. As shown, in anexemplary embodiment the heat sink fluid passages 40 are generallystraight longitudinal passages that may be coupled to, and in fluidcommunication with, each other. Further, as each heat sink 32 supportsthe electrical components 50, the electrical buses 70, and the sealingcompound 100, each heat sink 32 is also identified herein as part of thesupport assembly 20.

Each heat exchanger 34 is, in an exemplary embodiment, spaced from anddisposed longitudinally above heat sink 32. Heat exchanger 34 isstructured to dissipate heat and, in an exemplary embodiment, includes acondenser block 42 and a plurality of fins 44. As shown, condenser block42 is a generally rectangular block that includes a number of internalpassages (not shown). It is understood that the configuration of theheat exchanger condenser block 42 is not limited to this configuration,and may be modified in any shape or fashion so as to allow the optimalefficiency of the transfer of heat to the cooling medium. For example,condenser block 42 may be a number of tubular members (not shown)disposed in a block-like configuration and having a plurality of fins 44coupled thereto. Fins 44 provide an additional thermal surface toincrease the efficiency of the heat exchanger assembly 30.

As discussed below, the arm assemblies 16 are, in an exemplaryembodiment, disposed in 3×2 matrix, as shown in FIG. 4. That is, in anexemplary embodiment, the arm assemblies 16 are disposed as three setsof adjacent pairs. In this configuration, each heat exchanger 34 is onepart of an associated pair of heat exchangers 35. The pair of heatexchangers 35 includes a forward side 37 and rearward side 39,hereinafter heat exchanger forward side 37 and heat exchanger rearwardside 39. It is understood that a fluid, i.e. air, passes through thepair of heat exchangers 35.

Fluid conduits 36 are coupled to, and in fluid communication with, bothheat sink fluid passages 40 and condenser block passages. In thisconfiguration, a fluid within heat sink fluid passages 40 can betransferred to condenser block passages wherein the fluid is cooled. Inan exemplary embodiment, fluid conduits 36 and the fins 44 are made froma thermally conductive material, such as, but not limited to, aluminum,copper, etc. Thus, each heat sink 32 is operatively coupled to the heatexchanger 34 via the fluid conduits 36. As used herein with respect to aheat sink 32 and a heat exchanger 34, “operatively coupled” means thatthe two components are coupled in a manner that allows a heated fluid inthe heat sink 32 to move into the heat exchanger 34.

As shown in FIG. 2, the plurality of electrical components 50 includesat least two components 50, one of which is enclosed within theencapsulating compound 100. The plurality of electrical components 50includes transistors 52 and diodes 54. Transistor 52 is, in an exemplaryembodiment, a generally planar semiconductor power switch 53 and isshown as an Insulated Gate Bipolar Transistor 56 (IGBT). The IGBT 56includes a number of conductors (not shown) structured to be coupled tothe other electrical components 50. Generally, the IGBT 56 is insulatedfrom the heatsink assembly. A conductor of the IGBT 56 is coupled to adiode 54. The plurality of electrical components 50 also include, but isnot limited to, a power supply 58 and a gate driver 59. It is understoodthat the IGBT 56 shown is only an exemplary component. The semiconductorpower switch 53, such as IGBT 56, includes a generally planar body 60having a length, width and thickness. The length and width of thesemiconductor power switch 53 are both less than the length and width ofthe heat sink planar member 38.

The plurality of electrical buses 70 are structured to electricallycouple the electrical components 50 to each other and to a capacitorassembly 14. The number of buses may include a plurality of buses, butas shown in an exemplary embodiment, a single elongated bus assembly 72is used. Bus assembly 72 includes an elongated, generally planar body 74having an upper, first end, 76, a lower, second end 78, a proximal side80 and a distal side 82. In an exemplary embodiment, as shown, busassembly body 74 includes a number of tabs 84. Tabs 84 extend generallynormal to the plane of bus assembly body 74 and are disposed at bus bodyproximal side 80. In an exemplary embodiment, tabs 84 are portions ofL-shaped conductive bodies 86 that are coupled or fixed to, and inelectrical communication with, bus assembly body 74. It is understoodthat bus assembly 72 may also be a unitary body (not shown). Tabs 84 arestructured to be coupled to, and in electrical communication with,electrical components 50 and the capacitor assembly 14. That is, whenarm assembly 16 is assembled, bus assembly 72 is coupled to, and inelectrical communication with, IGBT 56, power supply 58 and gate driver59, as well as the capacitor assembly 14.

Each bus assembly 72 further includes a number of mounting tabs orterminals 88. Each mounting terminal 88 is coupled to, and in electricalcommunication with, bus assembly body 74. In an exemplary embodiment,each mounting terminal 88 is unitary with the bus assembly body 74. Inan exemplary embodiment, there are two mounting terminals 88′, 88″ thatextend in opposing directions and normal to the plane of the busassembly body 74. Each mounting terminal 88 is structured to be coupledto, and in electrical communication with, a capacitor assembly terminal13. Further, each neutral terminal, i.e. a mounting terminal 88 coupledto and electrical communication with a capacitor assembly neutralterminals 13′″, is further coupled to the associated heat sink 32 by aconductor (not shown) such as, but not limited to a conductive cable.

The heat exchanger assembly 30, plurality of electrical components 50(in the exemplary embodiment IGBT 56), and electrical buses 70 areassembled as follows. IGBT 56 is coupled to, or directly coupled to,heat sink planar member 38 with the planes of IGBT 56 and heat sinkplanar member 38 being generally parallel. That is, a broad, flat sideof IGBT planar body 60 is coupled to, or directly coupled to, a broadflat side of heat sink planar member 38. IGBT 56 and heat sink planarmember 38 each include a coupling assembly 41. In an exemplaryembodiment, heat sink coupling assembly 41 is a plurality of nuts andbolts as well as a number of passages 61 through IGBT 56 and heat sinkplanar member 38. IGBT planar body 60 is disposed adjacent to, or on,heat sink planar member 38 with the coupling assembly 41 extendingthrough the passages 61 in IGBT planar body 60 and sink planar member38. Bus assembly 72 is then coupled to IGBT 56, and in an exemplaryembodiment with a diode 54 disposed therebetween. The encapsulatingcompound 100 is applied using known processes, over and about theelectrical components 50 in such a manner as to substantially penetrateall, or almost all of the air pockets and gaps in and/or around theelectrically active devices. Each arm assembly 16 is then coupled to thesupport assembly 20 as described below.

The support assembly 20 is structured to electrically isolate each armassembly 16 from the housing assembly 12 and the ground. In an exemplaryembodiment, the support assembly 20 includes a non-conductive frameassembly 110, as shown in FIG. 3, a chassis 140, as shown in FIG. 4, anda heat exchanger isolation assembly 160, as shown in FIGS. 5 and 6. Asshown in FIG. 3, the frame assembly 110 includes a body 112 made from anon-conductive material and, in an exemplary embodiment, from fiberglassreinforced polymer or alternate insulating material. The frame assemblybody 112 includes two generally vertical posts 114, 116, disposed in aspaced relation, and two spaced generally horizontal members 120, 122.The horizontal members 120, 122 extend between and are coupled to, orunitary with, the posts 114, 116. Further, the frame assembly body 112includes dividers 124, 126 extending between the horizontal members 120,122. The dividers 124, 126 are positioned so as to define three cavities130 sized to generally correspond to a heat sink 32. The frame assemblybody 112 may include a number of positioning elements (not shown), e.g.planar tabs, disposed about the cavities 130 structured to support aheat sink 32. That is, the positioning elements generally align a heatsink 32 with a cavity 130 and support the heat sink 32 when the heatsink 32 is coupled to the frame assembly body 112. Further, the frameassembly body 112 maintains the heat sinks 32 in isolation. That is, asused herein, “isolation” means that the heat sinks 32 do not contacteach other or any component that is grounded, e.g. the housing assembly12.

As shown in FIG. 4, the chassis 140 includes a number of stanchions 142and a number of non-conductive cross-members 144. In an exemplaryembodiment, the stanchions 142 are non-conductive as well. Eachstanchion 142 includes an elongated body 146 disposed generallyvertically. In an exemplary embodiment, the number of stanchions 142includes four stanchions 142 disposed in a rectangular pattern. As usedherein, “in a rectangular pattern” means that the four stanchions 142are disposed so as to define two pairs of generally parallel planeswherein there are two close pairs of stanchions 142. That is, when thestanchions 142 are disposed “in a rectangular pattern” it is inherentthat there are two close pairs of stanchions 142.

Each cross-member 144 includes an elongated non-conductive body 150.Each cross-member 144 is coupled to, and extends between, a close pairsof stanchions 142. In an exemplary embodiment, there are sixcross-members 144 with three cross-members 144 coupled to, and extendingbetween, each close pair of stanchions 142. In an exemplary embodiment,each cross-member 144 is made from one of fiberglass reinforced polymeror an insulating material.

As shown in FIGS. 5 and 6, the heat exchanger isolation assembly 160 isstructured to isolate each heat exchanger 42. In an exemplaryembodiment, the heat exchanger isolation assembly 160 includes anon-conductive duct 162 and a non-conductive shroud 164. The duct 162includes a body 166 defining a passage (not shown). The duct 162 issized to correspond to the perimeter of the number of pairs of heatexchangers 35. That is, the duct 162 is sized to extend about theforward side 37 of the number of pairs of heat exchangers 35. Similarly,the shroud 164 includes a body 168 defining a passage (not shown) and isalso sized to correspond to the perimeter of the number of pairs of heatexchangers 35. That is, the shroud 164 is sized to extend about therearward side 39 of the number of pairs of heat exchangers 35. The ductbody 166 and the shroud body 168 are, in an exemplary embodiment, madefrom one of polypropylene or polycarbonate.

The support assembly 20 is assembled as follows. The stanchions 142 arecoupled to the capacitor assembly housing 15 and extend upwardlytherefrom. The frame assembly 110 is coupled to the chassis 140 and, inan exemplary embodiment, the vertical posts 114, 116 are coupled to across-member center portion 150. Thus, the frame assembly 110 isgenerally centrally disposed within the rectangular pattern ofstanchions 142. The arm assemblies 16 are then coupled to the frameassembly 110 with each heat sink 32 aligned with a cavity 130. In anexemplary embodiment, there are three arm assemblies 16 disposed on eachside of the frame assembly 110, thus forming the 3×2 matrix noted above.It is further noted that the frame assembly 110 maintains the opposingheat sinks 32 in a spaced relation The heat exchanger isolation assembly160 is then coupled to the number of heat exchangers 35 as noted above.That is, the duct 162 is coupled to, and extends about, the forward side37 of the number of pairs of heat exchangers 35, and, the shroud 164 iscoupled to, and extends about, the rearward side 39 of the number ofpairs of heat exchangers 35. Further, the duct 162 is coupled to the fanassembly 18 and the shroud 164 is coupled to a housing assemblysidewalls 17 at a vent. Further, each arm assembly neutral terminal 13′″is coupled to, and placed in electrical communication with, theassociated heat sink 32, i.e. the heat sink to which the neutralterminal's 13′″ arm assembly 16 is coupled.

In this configuration, each heat sink 32 is isolated via the frameassembly 110 and the heat exchanger isolation assembly 160. That is, asused herein, “isolated via the frame assembly 110 and the heat exchangerisolation assembly 160” means that there is no conductive path betweenthe heat sink 32 and the housing assembly 12 or the ground due to thenon-conductive nature of the frame assembly 110 and the heat exchangerisolation assembly 160. Stated alternately, while each heat sink 32 iscoupled to the housing assembly 12, and therefore the ground, via theframe assembly 110 and the heat exchanger isolation assembly 160, thenon-conductive nature of the frame assembly 110 and the heat exchangerisolation assembly 160 eliminates any current path between each heatsink 32 and the housing assembly 12, and therefore the ground. It isfurther noted that the non-conductive cross-members 144 of the chassis140 further ensure that there is no current path between each heat sink32 and the housing assembly 12, and therefore the ground.

While specific embodiments of the invention have been described indetail, it will be appreciated by those skilled in the art that variousmodifications and alternatives to those details could be developed inlight of the overall teachings of the disclosure. Accordingly, theparticular arrangements disclosed are meant to be illustrative only andnot limiting as to the scope of invention which is to be given the fullbreadth of the claims appended and any and all equivalents thereof.

What is claimed is:
 1. A support assembly for a power pole inverter,said power pole inverter including a capacitor assembly, a number of armassemblies, each arm assembly including a plurality of electricalcomponents and a number of electrical buses, each said electrical busincluding a body with terminals, each said terminal structured to becoupled to, and in electrical communication with, said capacitorassembly, each arm assembly including a neutral terminal, each armassembly coupled to, and in electrical communication with, saidcapacitor assembly, wherein said support assembly comprises: a number ofheat sinks; a support assembly including a non-conductive frameassembly; said support assembly structured to support each said heatsink in isolation; each heat sink coupled to said frame assembly; andwherein each heat sink is structured to be coupled to, and in electricalcommunication with, an associated arm assembly neutral terminal.
 2. Thesupport assembly of claim 1 wherein: said support assembly including achassis; said chassis including a number of stanchions and a number ofnon-conductive cross-members; each said cross-member coupled to, andextending between, a pair of stanchions; each said stanchion coupled to,and extending upwardly from, said capacitor assembly; and said frameassembly coupled to said cross-members;
 3. The support assembly of claim2 wherein: said number of stanchions includes four stanchions disposedin rectangular pattern; and each said cross-member coupled to, andextending between, each close pair of stanchions.
 4. The supportassembly of claim 3 wherein: the number of cross-members includes sixcross-members; and wherein three cross-members are coupled to, andextend between, each close pair of stanchions.
 5. The support assemblyof claim 3 wherein: each cross-member includes a center portion; andsaid frame assembly coupled to said cross-members at said cross-membercenter portion.
 6. The support assembly of claim 2 wherein eachcross-member is made from one of fiberglass reinforced polymer or aninsulating material.
 7. The support assembly of claim 1 wherein saidhousing assembly includes a fan assembly and each said arm assemblyincludes a heat exchanger assembly including a heat exchanger, andwherein said support assembly includes a heat exchanger isolationassembly structured to isolate each said heat exchanger.
 8. The supportassembly of claim 7 wherein said heat exchangers are disposed in alignedpairs, each said pair of heat exchangers including a forward side andrearward side, and wherein: said heat exchanger isolation assemblyincluding a non-conductive duct and a non-conductive shroud; said ductstructured to be disposed between said fan assembly and said heatexchanger forward side; and said shroud structured to be disposedbetween said heat exchanger rearward side and said housing assemblysidewalls.
 9. The support assembly of claim 7 wherein said duct and saidshroud are made from one of polypropylene or polycarbonate.
 10. Thesupport assembly of claim 7 wherein each said heat sink is isolated viasaid frame assembly and said heat exchanger isolation assembly.
 11. Apower pole inverter comprising: a housing assembly including a number ofsidewalls, said housing assembly sidewalls defining an enclosed space; acapacitor assembly, said capacitor assembly coupled to said housingassembly; a number of arm assemblies, each arm assembly including aplurality of electrical components and a number of electrical buses;each said electrical bus including a body with terminals, each saidterminal structured to be coupled to, and in electrical communicationwith, said capacitor assembly, each arm assembly including a neutralterminal; each arm assembly coupled to, and in electrical communicationwith, said capacitor assembly; a number of heat sinks; a supportassembly including a non-conductive frame assembly; said supportassembly structured to support each said heat sink in isolation; eachheat sink coupled to said frame assembly; each arm assembly neutralterminal coupled to, and in electrical communication with, an associatedheat sink; and wherein each said neutral terminal is electricallyisolated from said housing assembly.
 12. The power pole inverter ofclaim 11 wherein: said support assembly including a chassis; saidchassis including a number of stanchions and a number non-conductivecross-members; each said cross-member coupled to, and extending between,a pair of stanchions; each said stanchion coupled to, and extendingupwardly from, said capacitor assembly; and said frame assembly coupledto said cross-members;
 13. The power pole inverter of claim 12 wherein:said number of stanchions includes four stanchions disposed inrectangular pattern; and each said cross-member coupled to, andextending between, each close pair of stanchions.
 14. The power poleinverter of claim 13 wherein: the number of cross-members includes sixcross-members; and wherein three cross-members are coupled to, andextend between, each close pair of stanchions.
 15. The power poleinverter of claim 13 wherein: each cross-member includes a centerportion; and said frame assembly coupled to said cross-members at saidcross-member center portion.
 16. The power pole inverter of claim 12wherein each cross-member is made from one of fiberglass reinforcedpolymer or alternate insulating material.
 17. The power pole inverter ofclaim 11 wherein: said housing assembly includes a fan assembly; eachsaid arm assembly includes a heat exchanger assembly including a heatexchanger; said support assembly includes a heat exchanger isolationassembly structured to isolate each said heat exchanger; and said heatexchanger isolation assembly coupled to, and disposed between saidhousing assembly sidewalls and said heat exchanger and between said heatexchanger and said fan assembly.
 18. The power pole inverter of claim 17wherein: said heat exchangers are disposed in aligned pairs, each saidpair of heat exchangers including a forward side and rearward side; saidheat exchanger isolation assembly including a non-conductive duct and anon-conductive shroud; said duct structured to be disposed between saidfan assembly and said heat exchanger forward side; and said shroudstructured to be disposed between said heat exchanger rearward side andsaid housing assembly sidewalls.
 19. The power pole inverter of claim 17wherein said duct and said shroud are made from one of polypropylene orpolycarbonate.
 20. The power pole inverter of claim 17 wherein each saidheat sink is coupled to said housing assembly exclusively via said frameassembly and said heat exchanger isolation assembly.